US6687140B2 - Disconnection detecting circuit detecting disconnection based on a change in detection signal - Google Patents
Disconnection detecting circuit detecting disconnection based on a change in detection signal Download PDFInfo
- Publication number
- US6687140B2 US6687140B2 US10/211,305 US21130502A US6687140B2 US 6687140 B2 US6687140 B2 US 6687140B2 US 21130502 A US21130502 A US 21130502A US 6687140 B2 US6687140 B2 US 6687140B2
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- US
- United States
- Prior art keywords
- signal line
- disconnection
- detecting circuit
- signal
- resistor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/64—Means for preventing incorrect coupling
- H01R13/641—Means for preventing incorrect coupling by indicating incorrect coupling; by indicating correct or full engagement
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
Definitions
- the present invention relates to a disconnection detecting circuit which judges whether there is a disconnection or not in a signal line connecting a micro processor and an IC or a sensor which are used with high reliability at the same time in environments accompanied by vibration, such as in planes and automobiles.
- FIG. 10 is an explanatory diagram to show one example of a conventional disconnection detecting circuit.
- Reference numeral 1 denotes a device having a disconnection detecting circuit, such as a micro processor
- reference sign 1 a denotes a body of the device 1 , i.e., IC package
- reference numeral 2 denotes a lead member provided in the IC package 1 a
- reference numeral 3 denotes an IC chip on which an integrated circuit is formed
- reference numeral 4 denotes a bonding wire for connecting the lead member 2 and the IC chip 3
- reference numeral 5 denotes a bonding pad connected to the lead member 2 with the bonding wire 4
- reference numeral 6 denotes an output buffer which is a constituent of the integrated circuit formed on the IC chip 3
- reference numeral 7 denotes an input buffer which is a constituent of the integrated circuit formed on the IC chip 3
- reference numeral 8 denotes a peripheral device such as an integrated circuit device (hereinafter referred to
- a disconnection detecting circuit in which the device 1 and the peripheral device 8 are connected with the signal line 9 as an exemplary conventional one.
- a predetermined signal or signal level is set in the peripheral device 8 as an expected value.
- the peripheral device 8 outputs the expected value signal to the signal line 9 like an ordinary transmit data, to transmit it to the device 1 .
- the device 1 judges whether the received expected value signal coincides with the signal or signal level set in advance or not, for judgment on whether there is a disconnection or not in the signal line 9 .
- FIG. 11 is an explanatory diagram to show another example of conventional disconnection detecting circuit.
- the disconnection detecting circuit shown in FIG. 11 is intended for judgment on whether there is a disconnection or not in the signal line 9 without outputting the expected value signal from the peripheral device 8 , and constituent elements thereof identical to or corresponding to those of the disconnection detecting circuit of FIG. 10 are denoted by the same reference signs and further description thereon will be omitted.
- reference numeral 10 denotes a resistor loaded on the signal line 9 and reference numeral 11 denotes wiring capacitance generated in the signal line 9 which connects the peripheral device 8 and the device 1 .
- the disconnection detecting circuit shown in FIG. 11 detects disconnection by accumulating electric charges in the following procedure. To begin with, a predetermined signal is temporarily output from the output buffer 6 of the device 1 to the signal line 9 . Then, the electric charges are accumulated in the wiring capacitance 11 of the signal line 9 . After that, the output of the output buffer 6 is stopped and a given period later, the signal input to the device 1 through the lead member 2 is observed. From this observation result, it is judged whether there is a disconnection or not as follows. The observation is made on the output side of the input buffer 7 .
- This judgment on whether there is a disconnection or not, is made from a fact that if a terminal voltage of the peripheral device 8 connected to the signal line 9 is L, when an H signal is output from the output buffer 6 of the device 1 to the signal line 9 for a given period and stopped, the potential of the signal line 9 falls from H level and converges on the terminal voltage of the peripheral device 8 .
- This judgment on whether there is a disconnection or not, is made from a fact that if the terminal voltage of the peripheral device 8 connected to the signal line 9 is H, when an L signal is output from the output buffer 6 of the device 1 to the signal line 9 for a given period and stopped, the potential of the signal line 9 rises from L level and converges on the terminal voltage of the peripheral device 8 .
- the output of the output buffer 6 should be brought into a high impedance state so that it does not affect data to be measured which are output from the peripheral device 8 .
- the conventional disconnection detecting circuit has the above constitution, it is possible to perform a relatively easy detection of disconnection in the signal line or the like when the peripheral device has a function of outputting the expected value signal set in advance.
- the resistor is inserted in the signal line as shown in FIG. 11 and it is indirectly judged whether disconnection occurs in the signal line, using the characteristics that the wiring capacitance holds the electric charges for a given period.
- the time period while the electric charges are accumulated in the wiring capacitance and the length of time until the electric charges accumulated in the wiring capacitance are observed are closely related to a lot of factors, such as the resistance value of the resistor, the output characteristics of the peripheral device, the value of the wiring capacitance and the characteristics of the output buffer and the input buffer provided in the device, and they can not be uniquely determined.
- the present invention is intended to solve the above described problems and it is an object of the present invention to provide a disconnection detecting circuit capable of detecting disconnection in a signal line by a static measurement without inserting electronic components such as a resistor or the like in the signal line or without relation to an amount of the wiring capacitance, the resistance value of wires, the output characteristics of the peripheral device or the characteristics of the output buffer provided in the device even if the peripheral device has no function of outputting the expected value signal.
- It is another object of the present invention is to provide a disconnection detecting circuit capable of judging whether there is a disconnection or not in a wire between the peripheral device and a lead member serving as an input terminal of the device and, in addition, in a bonding wire connecting between a bonding pad to the lead member in the device and whether there is a poor connection or not in the connecting portion thereof.
- a disconnection detecting circuit includes a switch for setting a detection signal to be supplied for the signal line, a resistor for supplying the signal line with the detection signal set by the switch, and control means for controlling the switch to set the detection signal to be supplied for the signal line and judging whether there is a disconnection or not in the signal line on the basis of a change in the detection signal, which are provided in the device.
- the disconnection detecting circuit according to the present invention can produce an effect of detecting disconnection in a short time with a simple constitution.
- FIG. 1 is an explanatory diagram to show a disconnection detecting circuit in accordance with a first preferred embodiment of the present invention
- FIGS. 2 to 9 are explanatory diagrams to show the operation of the disconnection detecting circuit in accordance with the first preferred embodiment of the present invention
- FIG. 10 is an explanatory diagram to show one example of a conventional disconnection detecting circuit.
- FIG. 11 is an explanatory diagram to show another example of a conventional disconnection detecting circuit.
- FIG. 1 is an explanatory diagram to show a disconnection detecting circuit in accordance with the first preferred embodiment of the present invention.
- the disconnection detecting circuit is provided within an integrated circuit device (hereinafter referred to as “IC”) such as a micro processor.
- IC integrated circuit device
- reference numeral 1 denotes a device having the disconnection detecting circuit, such as a micro processor
- reference sign 1 a denotes a body of the device 1 , i.e., IC package
- reference numeral 2 denotes a lead member provided in the IC package 1 a.
- Reference numeral 3 denotes an IC chip (chip) provided within the IC package, on which an integrated circuit is formed
- reference numeral 4 denotes a bonding wire (connecting portion) for connecting the lead member 2 and the IC chip 3
- reference numeral 5 denotes a bonding pad (connecting portion) connected to the lead member 2 with the bonding wire 4
- reference numeral 6 denotes an output buffer which is a constituent of the integrated circuit formed on the IC chip 3
- reference numeral 7 denotes an input buffer which is a constituent of the integrated circuit formed on the IC chip 3
- reference numeral 8 denotes a peripheral device such as an IC, a sensor or the like, which is connected to the device 1
- reference numeral 9 denotes a signal line for connecting the device 1 and the peripheral device 8
- reference numeral 15 denotes a resistor
- reference numeral 16 denotes a switch (open/close switch) for turning on/off a connection between the resistor 15 and a power supply or the like
- the disconnection detecting circuit 18 provided in the device 1 itself in a state where the lead member 2 of the device 1 such as a micro processor is connected to the signal line 9 , i.e., where the device 1 is connected to the peripheral device 8 .
- the disconnection detecting circuit 18 comprises the switches 16 and 17 of ON/OFF open/close system, for example, consisting of transistor switches, and further comprises the resistor 15 connected to the switches 16 and 17 , and control means (not shown) for judging whether there is a disconnection or not in the signal line 9 by monitoring outputs of the input buffer 7 .
- a control means or the like in the device 1 serves as the above mentioned control means, and the present invention is intended for detection on whether there is a disconnection or not in the signal line 9 to which the device 1 such as a micro processor is connected itself without providing any additional components outside.
- connection terminals of the switch 16 is connected to the power supply or the like to which an H potential is supplied and the other connection terminal is connected to an connection terminal of the switch 17 as shown in FIG. 1 . Further, the other connection terminal of the switch 17 is connected to the ground to which an L potential is supplied.
- One end of the resistor 15 is connected to a connecting portion between the switches 16 and 17 . The other end of the resistor 15 is connected to the bonding pad 5 and an input port of a circuit which is a constituent of the device 1 , such as the input side of the input buffer 7 , or an I/O port.
- the bonding pad 5 , the output buffer 6 and the input buffer 7 constituting the integrated circuit of the device 1 are formed on the IC chip 3 and the disconnection detecting circuit 18 is also formed on the IC chip 3 as a part of the integrated circuit. Further, the disconnection detecting circuit 18 is not necessarily formed on the same chip only if it can produce the same action and effect.
- the bonding wire 4 is connected to the bonding pad 5 provided on the IC chip 3 and the bonding pad 5 is connected to the lead member 2 with this bonding wire 4 .
- the lead member 2 protrudes outside the IC package 1 a, and it is a portion for example, for soldering onto the pad formed on a substrate, or for making contact with a connector of a socket when the device 1 is inserted into the socket.
- the device 1 is connected to the signal line 9 using the lead member 2 .
- the control means provided in the device 1 performs setting and control of ON/OFF of the switches 16 and 17 and judgment on whether there is a disconnection in the signal line 9 on the basis of the output of the input buffer 7 .
- FIGS. 2 to 9 are explanatory diagrams to show the operation of the disconnection detecting circuit 18 in accordance with the first preferred embodiment of the present invention. Constituent elements identical to those in the disconnection detecting circuit 18 shown in FIG. 1 are denoted by the same reference signs and further description thereon will be omitted.
- FIG. 2 shows a state where the switch 16 is closed to supply the bonding pad 5 with an H supply signal.
- FIG. 3 shows a state where the switch 17 is closed to supply the bonding pad 5 with an L supply signal.
- FIG. 4 shows an equivalent circuit of the state shown in FIG. 2 and the peripheral device 8 of FIG. 2 is equivalently represented by a resistor 20 in FIG. 4 .
- the resistor 20 has two ends, one of which is connected to the signal line 9 and the other is connected to the ground.
- the switch 16 of FIG. 2 is in an ON state, the H supply signal supplied from the power supply or the like is supplied to the input side of the input buffer 7 , i.e., the bonding pad 5 through the resistor 15 , further transmitted to the lead member 2 through the bonding wire 4 , and supplied to the peripheral device 8 through the signal line 9 .
- FIG. 5 shows an equivalent circuit of the state shown in FIG. 3 and the peripheral device 8 of FIG. 3 is equivalently represented by a resistor 21 of FIG. 5 .
- the resistor 21 has two ends, one of which is connected to the signal line 9 and the other is connected to the power supply or the like, to which the H potential is applied.
- the switch 17 of FIG. 3 is in an ON state, since the ground and the resistor 15 are connected, the L supply signal is supplied to the input side of the input buffer 7 , i.e., the bonding pad 5 through the resistor 15 , further transmitted to the lead member 2 through the bonding wire 4 , and supplied to the peripheral device 8 through the signal line 9 .
- the H potential i.e., the H supply signal is supplied to the bonding pad 5 and a current A flows from the resistor 15 into the signal line 9 through the bonding pad 5 , the bonding wire 4 and the lead member 2 . If there is no disconnection in the signal line 9 , the current A flows into the resistor 20 whose one end is connected to the ground through the signal line 9 .
- the potential of the H supply signal supplied to the signal line 9 is drawn by the resistor 20 and the potential of the signal line 9 becomes L. Then, the L potential which is equivalent to the potential of the signal line 9 is applied to the lead member 2 and an input signal of L potential is input to the input buffer 7 .
- the control means which monitors the output of the input buffer 7 detects that the potential of the signal line 9 , i.e., the potential of the H supply signal converges on the potential of the terminal voltage of the peripheral device 8 , i.e., the L potential, from a fact that the L potential is detected at the output of the input buffer 7 when the signal line 9 is supplied with the H supply signal, and judges that there is no disconnection in the signal line 9 .
- the control means which detects the H potential from the input buffer 7 judges that there is a disconnection in the signal line 9 from a fact that the H potential is detected at the input buffer 7 when the signal line 9 is supplied with the H supply signal.
- the control means which monitors the output of the input buffer 7 detects that the potential of the signal line 9 , i.e., the potential of the L supply signal is changed to the potential of the terminal voltage of the peripheral device 8 , i.e., the H potential supplied from the resistor 21 to the signal line 9 , from a fact that the H potential is detected at the input buffer 7 when the signal line 9 is supplied with the L supply signal, and judges that there is no disconnection in the signal line 9 .
- the control means which detects the L potential of the signal line 9 from the input buffer 7 judges that there is a disconnection in the signal line 9 from a fact that the L potential is detected at the input buffer 7 when the signal line 9 is supplied with the L supply signal.
- the disconnection detecting circuit 18 provided within the device 1 detects disconnection in the signal line 9 . Further, though the above discussion is made only about detection of disconnection in the signal line 9 , the disconnection detecting circuit 18 can also detect whether there is a disconnection or not in the bonding wire 4 connected to the bonding pad 5 and whether connection between the bonding wire 4 and the bonding pad 5 or that between the bonding wire 4 and the lead member 2 are good or bad since the disconnection detecting circuit 18 supplies detection signals of the H supply signal and the L supply signal to the bonding pad 5 , i.e., the input side of the input buffer 7 . Furthermore, the disconnection detecting circuit 18 can also detect whether connection between the connecting portion in the substrate and the like to which the lead member of the device 1 is connected by soldering, and the lead member 2 of the device 1 , is good or bad.
- the lead member 2 of the device 1 shown in FIGS. 1 to 9 is a terminal of the device 1 , which is taken as an exemplary terminal of an I/O port or the like for dealing I/O signals and which is positioned adjoining to the input buffer 7 and the output buffer 6 .
- the disconnection detecting circuit 18 of the first preferred embodiment which monitors the output of the input buffer 7 and detects whether there is the disconnection or not in the signal line 9 from this output, the disconnection detecting circuit 18 can be provided in an input port which has no output buffer 6 .
- control means of the disconnection detecting circuit 18 may be so provided as to directly monitor the potential on the input side of the input buffer 7 , i.e., that of the constituent such as the bonding pad 5 , not the output of the input buffer 7 , and in this case, the same action and effect can be achieved.
- the IC chip 3 comprises the disconnection detecting circuit 18 , it is not necessary to load a resistor or the like on the signal line 9 and the potential of the signal line 9 becomes stable and thereby it is advantageously possible to stabilize the operation of the device 1 , the peripheral device 8 and the like without any influence on signals which are transmitted through the signal line 9 .
- the L supply signal or the H supply signal is output from the disconnection detecting circuit 18 , it is advantageously possible to perform the detection of disconnection in whatever terminal voltage level of the peripheral device 8 .
- the detection of disconnection is performed by supplying the input port or the like such as the input side of the input buffer 7 with the L supply signal or the H supply signal and monitoring the output of the input buffer 7 , it is advantageously possible to perform the detection of disconnection in the signal line 9 connected to the input port which has no output buffer 6 .
- the disconnection detecting circuit 18 comprises the switch 16 for switching ON/OFF of the H supply signal and the switch 17 for switching ON/OFF of the L supply signal, it is possible to produce an effect of avoiding any influence on signals transmitted on the signal line 9 by turning both the switches 16 and 17 off when the detection of disconnection is not performed.
- the detection of disconnection in the signal line 9 is performed by supplying the input side of the input buffer 7 or the like connected to the signal line 9 with the L supply signal or the H supply signal and monitoring the output side of the input buffer 7 , the parameters affecting the detection of disconnection are only the resistance value R1 of the resistor 15 in the disconnection detecting circuit 18 and the resistance value R2 of the equivalent resistor 20 or 21 of the peripheral device 8 , and therefore it is advantageously possible to provide the disconnection detecting circuit 18 which is capable of easily perform the detection of disconnection in the signal line 9 .
- the resistance value R1 of the resistor 15 in the disconnection detecting circuit 18 is efficiently larger than the resistance value R2 of the equivalent resistor 20 or 21 of the peripheral device 8 , it is advantageously possible to perform the detection of disconnection without breaking or deteriorating the output buffer 6 of the device 1 and the output buffer of the peripheral device 8 and also use the disconnection detecting circuit 18 for the detection of disconnection in signal lines transmitting analog signals.
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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
Description
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Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2002-37197 | 2002-02-14 | ||
JP2002037197A JP2003240810A (en) | 2002-02-14 | 2002-02-14 | Break detection circuit |
JP2002-037197 | 2002-02-14 |
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US20030151934A1 US20030151934A1 (en) | 2003-08-14 |
US6687140B2 true US6687140B2 (en) | 2004-02-03 |
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US10/211,305 Expired - Fee Related US6687140B2 (en) | 2002-02-14 | 2002-08-05 | Disconnection detecting circuit detecting disconnection based on a change in detection signal |
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JP (1) | JP2003240810A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1868002A1 (en) | 2004-07-19 | 2007-12-19 | Kodak IL Ltd. | Apparatus for position detection |
US20100175483A1 (en) * | 2001-04-13 | 2010-07-15 | Chf Solutions Inc. | Pressure sensor disconnect detection for a blood treatment device |
US9015516B2 (en) | 2011-07-18 | 2015-04-21 | Hewlett-Packard Development Company, L.P. | Storing event data and a time value in memory with an event logging module |
Families Citing this family (10)
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WO2006008732A2 (en) * | 2004-07-19 | 2006-01-26 | Kodak IL. Ltd. | Apparatus and method for interconnect verification |
EP2287562B8 (en) | 2008-06-10 | 2015-04-15 | Murata Manufacturing Co. Ltd. | External force detection device and wiring breakage detection method |
JP5510746B2 (en) | 2010-10-26 | 2014-06-04 | 株式会社デンソー | Electronic equipment |
JP6291979B2 (en) * | 2013-04-03 | 2018-03-14 | 株式会社デンソー | Input circuit with self-diagnosis function |
JP2016223802A (en) * | 2015-05-27 | 2016-12-28 | ファナック株式会社 | Electronic component having function to detect manufacturing defect, damage, and deterioration, and printed circuit board |
WO2017169057A1 (en) * | 2016-03-31 | 2017-10-05 | 日立オートモティブシステムズ株式会社 | Sensor device |
WO2019146258A1 (en) * | 2018-01-26 | 2019-08-01 | 三菱電機株式会社 | Semiconductor device and power conversion device |
CN111624518B (en) * | 2020-05-25 | 2022-11-25 | 南京英锐创电子科技有限公司 | Sensor and open circuit detection circuit thereof |
JP7228610B2 (en) * | 2021-03-03 | 2023-02-24 | プライムプラネットエナジー&ソリューションズ株式会社 | Disconnection diagnosis device and disconnection diagnosis method |
JP2024043193A (en) | 2022-09-16 | 2024-03-29 | ルネサスエレクトロニクス株式会社 | Semiconductor Device |
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JPS613073A (en) | 1984-06-18 | 1986-01-09 | Fuji Facom Corp | Disconnection detecting system for analog measuring system |
JPS62232578A (en) | 1986-04-02 | 1987-10-13 | Komatsu Ltd | Apparatus for detecting disconnection of sensor |
JPH0396873A (en) | 1989-09-11 | 1991-04-22 | Japan Servo Co Ltd | Detector for transfer abnormality of encoder signal |
US5416836A (en) * | 1993-12-17 | 1995-05-16 | At&T Corp. | Disconnect signalling detection arrangement |
US5942677A (en) * | 1997-09-16 | 1999-08-24 | Harris Corporation | Knock sensor system for detecting and responding to a disconnect condition |
-
2002
- 2002-02-14 JP JP2002037197A patent/JP2003240810A/en active Pending
- 2002-08-05 US US10/211,305 patent/US6687140B2/en not_active Expired - Fee Related
Patent Citations (5)
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JPS613073A (en) | 1984-06-18 | 1986-01-09 | Fuji Facom Corp | Disconnection detecting system for analog measuring system |
JPS62232578A (en) | 1986-04-02 | 1987-10-13 | Komatsu Ltd | Apparatus for detecting disconnection of sensor |
JPH0396873A (en) | 1989-09-11 | 1991-04-22 | Japan Servo Co Ltd | Detector for transfer abnormality of encoder signal |
US5416836A (en) * | 1993-12-17 | 1995-05-16 | At&T Corp. | Disconnect signalling detection arrangement |
US5942677A (en) * | 1997-09-16 | 1999-08-24 | Harris Corporation | Knock sensor system for detecting and responding to a disconnect condition |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US20100175483A1 (en) * | 2001-04-13 | 2010-07-15 | Chf Solutions Inc. | Pressure sensor disconnect detection for a blood treatment device |
US7886611B2 (en) * | 2001-04-13 | 2011-02-15 | Chf Solutions Inc. | Pressure sensor disconnect detection for a blood treatment device |
EP1868002A1 (en) | 2004-07-19 | 2007-12-19 | Kodak IL Ltd. | Apparatus for position detection |
US9015516B2 (en) | 2011-07-18 | 2015-04-21 | Hewlett-Packard Development Company, L.P. | Storing event data and a time value in memory with an event logging module |
US9418027B2 (en) | 2011-07-18 | 2016-08-16 | Hewlett Packard Enterprise Development Lp | Secure boot information with validation control data specifying a validation technique |
US9465755B2 (en) | 2011-07-18 | 2016-10-11 | Hewlett Packard Enterprise Development Lp | Security parameter zeroization |
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US20030151934A1 (en) | 2003-08-14 |
JP2003240810A (en) | 2003-08-27 |
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